WebTypes of SQL Commands. There are five types of SQL commands: DDL, DML, DCL, TCL, and DQL. 1. Data Definition Language (DDL) DDL changes the structure of the table like creating a table, deleting a table, altering a table, etc. All the command of DDL are auto-committed that means it permanently save all the changes in the database. WebPostgreSQL has a rich set of native data types available to users. Users may add new types to PostgreSQL using the CREATE TYPE command. Table 8-1 shows all the built-in …
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